AI Article Synopsis
- - A new series of garnets named ErGaO has been studied, revealing their crystal structures in both polycrystalline and single-crystal forms, with specific site occupancy of Er ions.
- - The garnet phase transition occurs at a range of 0.5 to 0.6, exhibiting long-range antiferromagnetic order at low temperatures (around 0.8 K) that suggests unusual magnetic properties due to frustration.
- - The study indicates that while the magnetic ordering temperature remains constant despite varying Er amounts, increased Er excess leads to higher residual entropy and aligns with behaviors seen in frustrated magnetic systems under applied fields.
Article Abstract
A series of garnets of formula ErGaO are described, for which we report the crystal structures for both polycrystalline and single-crystal samples. The limit in the garnet phase is between 0.5 and 0.6 under our conditions, with the Er fully occupying the dodecahedral (24c) garnet site plus some of the octahedral site (16a) in place of the Ga normally present. Long-range antiferromagnetic order with spin-ice-like frustration is suggested by the transition temperature ( ≈ 0.8 K) being lower than the Curie-Weiss theta. The magnetic ordering temperature does not depend on the Er excess, but there is increasing residual entropy as the Er excess is increased, highlighting the potential for unusual magnetic behavior in this system. The field-dependent magnetic entropy trend is consistent with the reported behavior for frustrated triangular magnetic systems: an increasing transition temperature with a broader hump as the applied field increases [Xing, J.; 2019, 3(11), 114413;Filippi, J.; 1977, 23(9), 613-616; Bloxsom, J. A. Thermal and Magnetic Studies of Spin Ice Compounds. University College London, 2016].
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